package com.yeb.server.config.websocket;

import com.yeb.server.config.security.JwtTokenUtil;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.simp.config.ChannelRegistration;
import org.springframework.messaging.simp.config.MessageBrokerRegistry;
import org.springframework.messaging.simp.stomp.StompCommand;
import org.springframework.messaging.simp.stomp.StompHeaderAccessor;
import org.springframework.messaging.support.ChannelInterceptor;
import org.springframework.messaging.support.MessageHeaderAccessor;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
import org.springframework.web.socket.config.annotation.StompEndpointRegistry;
import org.springframework.web.socket.config.annotation.WebSocketMessageBrokerConfigurer;

/**
 * @Author liushizhong
 * @Date 2022/1/7 12:02
 * @Version 1.0
 * websocket 配置
 */

@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {

    @Value("${jwt.tokenHead}")
    private String tokenHead;
    @Autowired
    private JwtTokenUtil jwtTokenUtil;
    @Autowired
    private UserDetailsService userDetailsService;

    /**
     * 添加endpoint ，这样网页可以通过websocket连接上服务
     * 也就是我们配置websocket的服务地址，并且可以指定是否使用socketJS
     * @param registry
     */
    @Override
    public void registerStompEndpoints(StompEndpointRegistry registry) {
        /**
         * addEndpoint:将路径”/ws/ep"路径注册为stomp端点，客户端通过连接这个端点使用websocket进行通讯，支持socketJS
         * setAllowedOrigins("*"):允许跨域
         * setAllowedOrigins("*")：支持socketJS访问
         */
        registry.addEndpoint("/ws/ep").setAllowedOrigins("*").withSockJS();
    }

    /**
     * 输入通道参数配置
     * @param registration
     */
    @Override
    public void configureClientInboundChannel(ChannelRegistration registration) {
        registration.interceptors(new ChannelInterceptor() {
            @Override
            public Message<?> preSend(Message<?> message, MessageChannel channel) {
                StompHeaderAccessor accessor = MessageHeaderAccessor.getAccessor(message,StompHeaderAccessor.class);
                // 判断是否是连接，如果是，需要获取token,并且设置用户对象
                if(StompCommand.CONNECT.equals(accessor.getCommand())){
                    String token = accessor.getFirstNativeHeader("Auth-Token");
                    // token 不空
                    if(!StringUtils.isEmpty(token)){
                        // 截取字符串
                        String authToken = token.substring(tokenHead.length());
                        // 获取用户名
                        String userName = jwtTokenUtil.getUserNameFromToken(authToken);
                        // 用户名不空
                        if(!StringUtils.isEmpty(userName)){
                            // 登入
                            UserDetails userDetails = userDetailsService.loadUserByUsername(userName);
                            // 验证token是否有效，并设置用户对象
                            if(jwtTokenUtil.validateToken(authToken,userDetails)){
                                UsernamePasswordAuthenticationToken authenticationToken =
                                        new UsernamePasswordAuthenticationToken(userDetails,null,
                                                userDetails.getAuthorities());
                                // 设置到全局上下文
                                SecurityContextHolder.getContext().setAuthentication(authenticationToken);
                                accessor.setUser(authenticationToken);
                            }
                        }
                    }

                }
                return message;
            }
        });

    }

    /**
     * 配置消息代理
     * @param registry
     */
    @Override
    public void configureMessageBroker(MessageBrokerRegistry registry) {
        /**
         * 配置代理域，可以配置多个，
         * 配置代理目的地前缀为“/queue”,
         * 可以在配置域上向客户端发送消息
         */
        registry.enableSimpleBroker("/queue");

    }
}
